ML18348A232

LER 1977-023-43 Result of Pressure Loss from Waste Gas Decay Tank T-101A

ML18348A232
Person / Time
Site:	Palisades
Issue date:	05/04/1977
From:	Hoffman D Consumers Power Co
To:	James Keppler NRC/IE, NRC/RGN-III
References
LER 1977-023-43
Download: ML18348A232 (3)

Text

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consumers

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• Power company General Offices: 212 West Michigan Avenue, Jackson, Michigan 49201

• Area Code 517 788-0550 May 4, 1977

. '.Rlegulatory Docket File Mr James G Keppler Office of Inspection Region III US Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 DOCKET 50-255 - LICENSE DPR PALISADES PLANT - ER-77 WASTE GAS DECAY TANK, T-lOlA, PRESSURE LOSS .

• Attached is a reportable occurrence which is the result of pressure loss from waste gas decay tank T-lOlA at the Palisades Plant.

Mr Ken Baker was notified that the submission of this ER would be a day or two late.

David P Hoffman Assistant Nuclear Licensing Administrator

. ~ .. 6.1cENSEE EVENT REPORT

• Palisades CONTROL BLOCK: l..___.____,___._...__....._~I (PLEASE PRINT ALL REQUIRED INFORMATION]

1 6 LICENSEE LICENSE EVENT NAME LICENSE NUMBER TYPE TYPE I Ml IIPI Al Ljl I 10101-10101010101-10101.14111111111 I4I 3I 7 8 9 14 15 25 26 30 31 32 AEPOA\ REPORT TYPE SOURCE DOCKl;T NUMBER EVENT DATE REPORT DATE

@ill coN'T r

• 1** 1 ~~ 1015101-101215151 IOl4lll9 I 7171 1°151°1417171 7 B 57 58 59 60 61 68 69 . 74 75 80 EVENT OESCRIPTION

@BJ I On April 6, 1977, waste gas decay tank T-lOlA was overpressured to 112 psig and, over I 7 B 9 80.

joj3j I the next 10 days, while isolated, the tank lost 10 psig resulting in a violation of I 7 8 9 80 lol41 I Technical Specification 3,9.17.a. Total gaseous releas.e was 3. 206 curies or

• 00076% I 7 8 9 80

@:lliJ 1 of our yearly limit (primarily Xe-133). No personnel exposures were involved. I 7 8 9 80 lolsl I Activity was below detectability of the plant exhaust stack monitor. (ER-77-23) I 7 8 9 PRIME 80 SYSTEM CAUSE COMPONENT °COMPONENT CODE CODE COMPONENT CODE SUPPLIER MANUFACTURER VIOLATION

@El 7 B 9 10 I Ml BI W 11 I zl z I z I z I z I z I 12 17 w 43 I zI I I I 44 9 9 9 47 LIJ 48 CAUSE DESCRIPTION lfil~l 1 Waste gas decay tank (WGDT) T-lOlA was put into service with the pressure sigma Fe- I 7 8 9 80 lol91 I moved. The high-pressure alarm is part.of the sigma. There is also a pressure re- I 7 8 9 80

.iiJOJ I corder which is independent of the ~igma. On April 6, 1977 the volume control tank I

~9 FACILITY METHOD OF (Contd on Attached Sheet) 80 DISCOVERY DESCRIPTION EE) 7 8 STATUS Ll2J 9 10

% POWER I I I I I 0 0 0 12 13 ShuPt.HoEwnASTtATOUSHot' t~tand.by I 44 w

DISCOVERY 45 46

____ N_A

____________ ~________ ._,I 80 FOAM OF ACTIVITY CONTENT I LOCATION OF RELEASE 7

rn w8 RELEASED 9

OF RELEASE 10 11 AMOUNT OF ACTIVITY

• *l!_J . 3. 206 Curies Total I 44 45 Exhaust Stack 80 PERSONNEL EXPOSURES NUMBER TYPE OESCRIPTION 7

[2))

8 9 lol olol 11 w12 13 None 80 PERS.ONNEL INJURIES NUMBER DESCRIPTION EE}

7 8 I 0 I 0 I 011I 9

None 1-2--------------------------------------------.---------------------------8...10 PROBABLE CONSEQUENCES EJfil None 7 8 9 80 LOSS OR DAMAGE TO FACILITY TYPE DESCRIPTION IIlfil8 9.w 7 10 .

NA 80 PUBLICITY om 7 8 9 NA 80 ADDITIONAL FACTORS

• I Cause Description continued on attached sheet.

7 8 9 . 80 illfil8 9 7 80

.. -! ... -~~. *

• LICENSEE EVENT REPORT Palisades Cause Description (Contd) was vented to the T-101A WGDT leaving the tank at 91 psig. The oncoming shift assistant operator (AO) asked the shift supervisor if he should isolate the tank. The shift supervisor replied "No," and if venting was needed to monitor the pressure and remove tank from service at 95 psig per operating procedures.

At approximately 1700 hours0.0197 days <br />0.472 hours <br />0.00281 weeks <br />6.4685e-4 months <br />, the chem lab technician opened the volume control tank sample valve and left open for approximately two hours, increasing T-lOlA pressure by 21 psig. The AO noticed tank pressure at 112 psig and isolated the tank. The tank started leaking slowly almost immediately. On April 10, 1977 the shift supervisor had the Maint Dept tighten the spring tension on all valves.

The leakage slowed down immediately at 102 psig; 1 psig was transferred when the tank was sampled. The tank reached 101 psig on April 16, 1977 violating Technical Specification 3.9.17.a. The loss of 9 psig over approximately 88 hours0.00102 days <br />0.0244 hours <br />1.455026e-4 weeks <br />3.3484e-5 months <br /> released 3.206 Ci, primarily Xe-133, which is ,,00076% of the yearly limit.

Log sheets indicate that the activity was transferred to the new WGDT, T-68B, that was in service. However, as the activity was below sensitivity of plant effluent monitors, it is hard to prove or disprove this absolutely .